The historic site is a replica of the 1802 American fort that was on site. The historic fort area contains 2 barracks, 3 block houses, officer quarters, well, stockade along with a fraise fence. The site also has the archaeological outline of the 1757 French Fort. There is also a visitors center/office complex along with an area for the museum.

http://dnr.state.il.us/lands/LANDMGT/parks/r5/frmindex.htm